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1. Spring (Throttle Valve) 2. Jet Needle Assembly 3. Throttle Valve (Slide) 4. Throttle Stop Screw (Idle Adjustment) 5. Air Screw 6. Choke 7. Pilot Jet 8. Main Nozzle (Needle Jet) 9. Main Jet 10. Valve Seat Assembly 11. Float 12. Float Pin 13. Float Bowl 14. Drain Screw |
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Stock YSR Carb |
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Float Bowl removed |
 |
Cap Spring Keeper Needle Slide |
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Three Pin holes, and two on the other side must be clean |
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Your carb could have either of these types of main jets |
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Your Carb could have either of these types of needles |
| Main Jet | 120 |
| Pilot Jet | 17.5 |
| Jet Needle | 3G21-4 |
| Needle Jet | E-0 |
| Slide Cut Away | 2.0 |
| Air Screw | 1 1/8 |
| Valve Seat | 1.5 |
| Float Height | 21~23mm |
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When cleaning the carb, pay particular
attention to #
7 pilot jet, and #8 Needle jet. Along the shaft of the needle
jet are 5 very small pin holes. Carb Cleaner won't even touch
these! Take one strand of elecrical wire and "ream"
out the 5 holes. Then cover one end of needle jet with your finger
and shoot contact cleaner in the other end. You should see 5
streams of contact cleaner come out of the 5 pin holes. Do the
same to the pilot jet. |
| Graph showing interaction of Carb Components |
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That's it for this month, shoot
me some E-mail if
you have specific YSR questions and I'll do my best to answer
them as time allows, and/or suggestions for topics in "Tech
Tips!" Remember this page is for you! |
